Ticket #23846: 23846.patch

wp-admin/css/wp-admin-rtl.css

@@ -1717 +1717 @@
 }
 
 /* Collapse Button */
-.wp-full-overlay .collapse-sidebar {
+.wp-full-overlay a.collapse-sidebar {
         right: 0;
         left: auto;
         margin-right: 15px;
+        margin-left: 0;
 }
 
 .wp-full-overlay.collapsed .collapse-sidebar {